Cushioned pneumatic tire.



PATENTBD MAY 29, 1906..

Non. 821,871.

D. B. HISLOP. -GU'SHIONED PNEUMATIC TIRE.

AP-PLIOATIQN IiLED SEPT.16,1905.

D shock being absorbed or diffused by an airtread of the wheel of a hl o. 20,144, hearing date DAVID BLAIKIE HISLOP, OF ABERDEEN, SCOTLAND,

GUSHIONED PNEUMATIC TIRE.

Specification of Letters Patent.

Eatented May 29, 1906.

Application filed September 16, 1905. Serial No- 278,829.

To all whm'n; iii-may concern:

Be it known that I, DAVID BLAIKIE Hrs- Lor, a subject of-the King of Great Britain and Ireland, and a resident of Aberdeen, in the county of Aberdeen, Scotland, (whose ost-ofiice address is Littlejohn street, Metal Works, Aberdeem) have invented a certain new and useful Improvement in and Relating to Cushioned Pneumatic Tires, for which I have applied for a patent in Great Britain, September 19, 1904,

of which the following is a specification.

This invention relates to cushioned pneu- Jatic tires or wheels, the object being to provide tires which will not readily puncture,

which will not distort, and which will be suitable for motor-cars, the vibration from road chamber within the Wheel, and in order that my said inventionand the manner of performing or carrying the same into effect or practice may be properly understood I have hereunto appended an explanatory sheet of drawings, in which the same reference-numerals are used. to indicate corresponding parts in all the figures where shownthat is to say: I

Figure 1 is a part side elevation of a wheel constructed in accordance with my invention. Fig. 2 is a part elevationlooking in the direction of the arrow A, Fig. 1. Fig. 3 is a part-sectional elevation at B B B B, Fig. 4. Fig. 4 is a part cross-sectional elevation at C 1 (1,.Fig. 3.

In carrying out my invention I form the thick ring of molded rubber, which in itself forms the elastic cushion to some extent. In each side of the rubber ring is a disk of metal 11, these two disks forming part of or being attached to the hub of-the wheel, bolts or studs 12 and 13 being used to bind the disks and the rubber ring together. In order that the disks when thus connected may not set up undue lateral pressure on the ring, distance-pieces 14'- that is to say, ferrules are threaded on the bolts between the disks. The disks of metal may be strengthened by radial arms 15 or radial corrugations, or they may be made more elastic by having concentric corrugations formed in them. Within the chamber .16, whose sides consists of t 10 innersurfaces oi the distance-blocks 17, the inner surfaces of the disks 11, and the ring 18 is aring orbag 19 of rubber, win h acts as an air-chamber,

and stoppage on such bag being in connection with an airvalve 20, passing through the side of the disk. When the air-bag is inflated, metal distanceblocks 17 held in a groove in the ring of rubber forming the tread of the wheel, bear against the elastic cushion thus formed, 21-

being a cushion of thickened tread of rubber I vulcanized onto the other circumference'of the bag 19 iii order that wear and tear may be reduced. The transverse bolts 13 each pass througha distance-block 17, and so retains it in its place, although still allowing each separately to move radially for a distance determined by the slots 22. To keep the airbag from adhering to the'metal walls of its case, the two surfaces of the inside may be tinned or enameled or a pieceof canvas or liinep may be placed. between the bag and the Between the metal distance-blocks 17 and the thickened tread 21 of the bag 19 a strip of rubbered canvas or other suitable material is placed to prevent any possibility of the blocks chafing the rubber bag.

The whole wheel is freely lubricated with French chalk.

The wheel performs its functions in the following manner: The bag 19 being inflated, it presses the blocks 17 radially outward. The block or blocks 17 which are nearest the ground are pressed inward'with a force pro portionate to the weight which is on the wheel, their amount of movement depending on the load on the wheel and the degree of inflation of the bag. The'spaces 23 between the blocks become reduced according to their inward radial movement. As the wheel rotates each block in turn is pressed inward against the bag. By' the combination of the bag 19, blocks 17, and tire 10 there is provi ed a tire which cannot puncture and can run perfectly well as a solid tire if deflated, obviating any danger of total disablementv the road. It has all the elasticity of an ordinary pneumatic tire.

Having'nowdescribed my invention, what I claim as new, and desire to secure by Lettcrs Patent, is

A wheel comprising a hub, side members secured thereto, an elastic cushion 10 gri ped between the outer edges of said members, bolts 13 adjacent the outer edges of said members for holding the members in griping. relation with the cushion, a plurality of locks having slots therein through which zoo the belts pass, said blocks lying between the members,.an annular inflatable bag arranged between the side members an'd' the hub and blocks and a, cushion 21 between the outer; edge bf said bag and the inner edges ofthe; \'b1ocks,- said blocks being arranged with,

space between their adjacent edges.

"l 111 witnesswhereef I have hereunto setmy -ftha1id,flinpresence of two witnessesgthis 31st 1 'dsiy of-August d90fiu.

' 1 DAVID BLAIKIEHISLOP.

Witnesses; v v

' JAMEs' WA KER;

HENRY; A, B. NAV'ELL. 

